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Method for preparing high-pure aluminum oxide

A high-purity alumina and aluminum sulfate technology, applied in the preparation of alumina/aluminum hydroxide, alumina/hydroxide, etc., can solve the problems of large differences in main content, complex process flow, complex and harsh operating conditions, etc.

Inactive Publication Date: 2013-02-06
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All of these methods have problems such as complex process flow, complex and harsh operating conditions, many types of raw materials involved, large differences in main content, vastly different impurity components, high energy consumption for solution heating, and the need to purchase special equipment, which leads to large investment in production equipment and high product costs. , it is difficult to promote and use in the current industrial production at home and abroad

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Add industrial hydrochloric acid into a round-bottomed flask, and gradually heat it slowly. The evaporated hydrogen chloride gas is filtered through activated carbon and quartz wool to remove Fe, heavy metals, and SO. 4 2- , Free chlorine and other impurities, and then pass into conductive water to be absorbed and become high-purity hydrochloric acid for use. The hydrochloric acid used in Example 2, Example 3, and Example 4 are all hydrochloric acid prepared in this way.

[0016] Analysis result of impurity content of hydrochloric acid obtained by filtering hydrogen chloride system with activated carbon

[0017]

Industrial hydrochloric acid impurity content Impurity content of hydrochloric acid after refining Mass fraction of iron (calculated as Fe)0.0080.001 Free chlorine (as Cl) mass fraction0.0080.0006 Mass fraction of heavy metal (as As) 0.00010.00001 Sulfate (as SO 4 2- Count) quality score 0.030.005

[0018] Add 1000g of 18-water industrial aluminum sulfate to dei...

Embodiment 2

[0025] Add 1000g of 18-water industrial aluminum sulfate to deionized water, slowly heat it under constant stirring to dissolve it to 95°C, cool the concentrated solution, filter, crystallize and dry out, and filter the filtrate with a Buchner funnel after it settles for 20 hours to remove impurities. recycle.

[0026] Dissolve 100g of industrial premium grade ammonium sulfate in deionized water, dissolve it under constant stirring, and filter to remove mechanical impurities to obtain a clear filtrate.

[0027] Dissolve the dried crystalline aluminum sulfate with deionized water, slowly add ammonium sulfate solution under constant stirring to 85°C, add 8g tartaric acid, continue heating to keep the solution temperature unchanged, and filter while the crystals are about to precipitate. The filtrate is concentrated, cooled and crystallized, the crystals are shaken dry and recrystallized twice, and the mother liquor is recovered and reused.

[0028] Take 150g of recrystallized aluminum...

Embodiment 3

[0032] Add 1500g of 18-water industrial aluminum sulfate to deionized water, slowly heat it under constant stirring to dissolve it to 95°C, cool the concentrated solution, filter, crystallize and dry, and remove impurities after the filtrate settles for 20 hours for recycling.

[0033] Dissolve 120g of industrial premium grade ammonium sulfate in deionized water, dissolve it under constant stirring, and filter to remove mechanical impurities to obtain a clear filtrate.

[0034] Dissolve the dried crystalline aluminum sulfate in deionized water, slowly add ammonium sulfate solution under constant stirring, to 95°C, add 6g of citric acid and other organic acids, continue heating to keep the solution temperature unchanged, and wait while the crystals are about to precipitate while hot filter. The filtrate is concentrated, cooled and crystallized, the crystals are shaken dry and recrystallized twice, and the mother liquor is recovered and reused.

[0035] Take 100g of recrystallized alu...

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PUM

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Abstract

The invention relates to a method for preparing high-pure aluminum oxide. The method comprises the following steps: organic acids such as ammonium sulfate and tartaric acid are added in purified industrial aluminum sulfate to remove iron, so as to obtain an aluminum ammonium sulfate solution; the aluminum ammonium sulfate is reacted with refined hydrochloric acid; the obtained crystal is washed, dried, fired and milled, and finally the high-pure aluminum oxide is obtained. The method is simple in production technology; and the obtained aluminum oxide has high purity which can reach 99.999% even 99.9999 spectrum purity.

Description

Technical field [0001] The invention relates to the technical field of inorganic alumina powder preparation. Specifically, it is a method for preparing high-purity alumina. Background technique [0002] Alumina is the basic material of many industrial production processes and occupies an important position in the chemical market. Ordinary alumina is mainly obtained from the bauxite smelting process, and its purity is low, and it cannot meet the process requirements in many applications. Alumina with a purity of over 99.99% belongs to high-purity alumina. High-purity alumina has the advantages of high purity, fine particle size, uniform particle size distribution, etc., showing superior optical, electrical, magnetic, thermal and mechanical properties than ordinary alumina, and can be widely used as a new type of functional material for light transmission Sintered alumina sintered body, phosphor carrier, additives for special gases, single crystal materials, advanced ceramics, ...

Claims

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Application Information

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IPC IPC(8): C01F7/02C01F7/30
Inventor 孙春晖于海斌陈永生刘伟许岩
Owner CHINA NAT OFFSHORE OIL CORP
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